20396987834 has 8 divisors (see below), whose sum is σ = 31925720160. Its totient is φ = 9755081116.

The previous prime is 20396987813. The next prime is 20396987837. The reversal of 20396987834 is 43878969302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20396987834² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20396987837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221706344 + ... + 221706435.

It is an arithmetic number, because the mean of its divisors is an integer number (3990715020).

Almost surely, 2^20396987834 is an apocalyptic number.

20396987834 is a deficient number, since it is larger than the sum of its proper divisors (11528732326).

20396987834 is a wasteful number, since it uses less digits than its factorization.

20396987834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443412804.

The product of its (nonzero) digits is 15676416, while the sum is 59.

The spelling of 20396987834 in words is "twenty billion, three hundred ninety-six million, nine hundred eighty-seven thousand, eight hundred thirty-four".